G'day June,

Based on my understanding you can store Methylated Spirits in HDPE Plastics. We do advise proceeding with caution and make sure the container is very clearly marked "Fuel Only" to reduce accidental poisoning risk. We'd generally recommend the Trangia Fuel Bottles as the safest option.

G'day Melanie,

The Nalgene Wide Mouth Rectangular Bottles have twist-off lids.

G'day Debra,

You'll just need to select the size, and then the packed dimensions will update for the selected size.

G'day Mike,

Not a dumb question at all, and always good to triple check these things.
HDPE (High-Density Polyethylene) is classified as food safe and has pretty consistently held this rating for the last 20 years.  Its corrosion resistant and non-porous so you should have no trouble storing stuff longer term.
Hope that helps.

G'day Clara,

We'd recommend against using a steripen with these Nalgene Wide Mouth Rectangular Bottles as it while you can fit it into the larger sizes, it's difficult to give the fluid inside a proper stir. These containers are designed for more food/fluid storage, but not so much drinking water. Have you considered the Nalgene Wide Mouth Tritan Water Bottles? They have a larger mouth that you can easily fit the steripen into.